Walnuts, almonds or macadamias?
In this investigation
There is a useful reason to choose walnuts
I love walnuts and enjoyed almonds. The latest report included about 10–15 almonds and a similar amount of walnuts, with equal weight assumed for the calculation. That is enough to identify the foods; it does not establish exact grams or equal calories.
The omega-3 entry develops walnuts’ ALA contribution; the vitamin E entry develops almonds’ contribution. The trials below compare specific outcomes rather than establishing one best nut for every purpose.
The current available-value estimate places most recorded ALA in the assumed walnut portion. That makes walnuts a coherent addition to this pattern, especially because they are liked. The portion remains an estimate; a small change in assumed grams changes the ALA number, and a value near an AI does not diagnose adequacy or deficiency.
Lipid effects are real enough to investigate, and usually modest
In the two-year WAHA trial, 708 adults aged 63–79 were assigned walnuts at roughly 30–60 g daily or a walnut-free diet. Lipoprotein analyses in 628 participants found a mean LDL-cholesterol reduction of 4.3 mg/dL, with a 95% confidence interval of 1.6–6.6 mg/dL lower. Several particle measures also improved, while triglycerides and HDL cholesterol did not. This supports a modest lipid effect in older adults; it is neither a measured change in my blood nor proof that my much smaller estimated portion produces the same effect. Rajaram et al., 2021
The ATTIS trial compared almonds with calorie-matched snack foods for six weeks in 107 adults aged 30–70 at above-average cardiovascular risk. Almonds replaced snacks at 20% of estimated energy, a larger exposure than the nuts in my latest report. LDL cholesterol was 0.25 mmol/L lower on average, with an improved vessel-dilation measure. Liver fat, blood pressure and several glucose-related outcomes did not significantly differ. The replacement food and the outcome being measured both matter. Dikariyanto et al., 2020
Macadamia findings show why a promising nutrient or molecule does not guarantee a clinical result. A controlled feeding trial in 25 people found lower LDL cholesterol on a macadamia-rich diet than on an average American comparator, but saturated fat also fell substantially. A later free-living crossover trial in 35 adults with abdominal obesity used macadamias at about 15% of daily energy for eight weeks. Its LDL reduction was not statistically significant, and glucose, insulin and several other measures did not improve. The earlier substitution result and the later uncertain result can both be true. Griel et al., 2008, Jones et al., 2023
WAHA, ATTIS and the 2023 macadamia trial received support from the California Walnut Commission, Almond Board of California and Hort Innovation, respectively. Their findings still depend on the designs, comparators and outcomes described above; independent replication would strengthen the evidence. WAHA disclosures, ATTIS disclosures, Macadamia disclosures
Brain and longevity claims need a separate result
The cognitive report from WAHA is especially relevant to claims about walnuts and the brain. Two years of walnuts produced no significant overall benefit in the primary global-cognition outcome. A favorable exploratory result at one study center was not the main trial conclusion. The lipid and cognition papers are reports from the same trial, not independent replications of a general anti-aging effect. Sala-Vila et al., 2020
The corrected PREDIMED account examines the mixed-nut dietary program, its population and randomization limitations; it cannot identify one nut as responsible.
Keep the portion practical
Walnuts and almonds can share a modest nut portion rather than each becoming a large new food requirement. Macadamias are an optional taste rotation. A new species does not need to be purchased for its palmitoleic acid merely because that molecule has an appealing mechanism.
For repeatable records, distinguish whole almonds from walnut halves and count each food separately. Equal counts do not mean equal weights. The saved household conversions are approximate; weighing one ordinary portion when a scale becomes available would improve future estimates without requiring daily measurement. A package’s labelled serving size is also different from the amount actually eaten.
Nuts fit the storage exception already used for almonds. Their strongest immediate value here is a liked, convenient food that adds specific nutrients and energy in a manageable volume. The next change should be guided by appetite and the food being replaced, while any claim about personal lipid improvement would require an actual measurement.